Claim ds-009 · Atlas v1.2.0

The Trans-Planckian Censorship Conjecture proposes that sub-Planckian fluctuations never cross the Hubble horizon and freeze, which bounds the lifetime of a de Sitter phase.

ds-009Conjecture

The Trans-Planckian Censorship Conjecture proposes that sub-Planckian fluctuations never cross the Hubble horizon and freeze, which bounds the lifetime of a de Sitter phase.

Why it is stated this way
TCC gives an independent route to swampland-like constraints, replacing "no de Sitter" with "no long-lived de Sitter". It has become central to the post-2019 debate and is treated as its own thread in the source map.
Scope and limitations
TCC is a conjecture. Skeptics note that the resulting bound forces a low inflation scale, which makes the observed amplitude of primordial perturbations hard to generate without fine-tuning.
Sources

Last reviewed 2026-07-27 · Atlas v1.2.0

← Back to the ledger

Source cards — 1

VerifiedPrimary paper2019

The Trans-Planckian Censorship Conjecture ↗

Authors
Bedroya, Vafa
ID
arXiv:1909.11063

Why this source is here — The founding Trans-Planckian Censorship paper, cited wherever the atlas states the lifetime bound.

Title not recorded in the source map; named here as the source map names it.